Will Thompson authored Dec 05, 2018 and Philip Withnall committed Dec 11, 2018

Since 1217b1bc, LICENSE_STR has taken two
parameters, not one. Without this change, running either mode fails
with a traceback like:

    Traceback (most recent call last):
      File "../gdbus-codegen", line 55, in <module>
        sys.exit(codegen_main.codegen_main())
      File ".../codegen_main.py", line 294, in codegen_main
        gen.generate()
      File ".../codegen.py", line 896, in generate
        self.generate_body_preamble()
      File ".../codegen.py", line 682, in generate_body_preamble
        self.outfile.write(LICENSE_STR.format(config.VERSION))
    IndexError: tuple index out of range

8916874e, which introduced these flags,
was actually merged after that commit, but I assume it was written
beforehand.